- Remove stale #[allow(dead_code)] and #[allow(too_many_lines)] attributes
- Replace #[allow(dead_code)] with #[cfg(test)] for test-only methods
- Delete unused fill_remaining_independent() and ParamMeta.dist field
- Extract sample_float/int/categorical helpers from TpeSampler, MotpeSampler,
and SamplingEngine to shorten match-heavy sample() methods
- Extract try_fit_kdes() helper to consolidate repeated fallback blocks
- Refactor sample_tpe_float/int to take &FloatDistribution/&IntDistribution
instead of destructured args, removing #[allow(too_many_arguments)]
Fix direct path references for in-scope items (GammaStrategy,
CompletedTrial) and convert feature-gated items to plain backtick
formatting so docs build cleanly without --all-features.
Manuel Raimann